package com.itheima.reggie.filter;

import com.alibaba.fastjson.JSON;
import com.itheima.reggie.common.BaseContext;
import com.itheima.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@Slf4j
@WebFilter(filterName = "loginCheckFilter", urlPatterns = "/*")
public class LoginCheckFilter implements Filter {
 public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();

 @Override
 public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {

  HttpServletRequest request = (HttpServletRequest) servletRequest;
  HttpServletResponse response = (HttpServletResponse) servletResponse;
  //1.获取本次请求的uri
  String requestURI = request.getRequestURI();
  log.info("拦截到请求：{}",requestURI);
  //定义不需要处理的请求路径
  String[] urls = new String[]{
   "/backend/**",
   "/front/**",
   "/employee/login",
   "/employee/logout",
   "/common/**",
   "/user/login",
   "/user/sendMsg",
   "/doc.html",
   "/webjars/**",
   "/swagger-resources",
   "/v2/api-docs"
  };
  // 2.判断本次请求是否需要处理
  boolean check = check(urls, requestURI);
  //3.如果不需要处理，则直接放行
  if (check){
   log.info("本次请求{}不需要处理，直接放行",requestURI);
   filterChain.doFilter(request,response);
   return;
  }
// 4.判断登陆状态，如果已登陆，则直接放行
  if (request.getSession().getAttribute("employee")!=null){
   log.info("用户已登陆，用户id为：{}",request.getSession().getAttribute("employee"));
   Long empId = (Long) request.getSession().getAttribute("employee");
   BaseContext.setCurrentId(empId);
   filterChain.doFilter(request,response);
   return;
  }
  //判断移动端登陆状态，若已经登陆直接放行 获取session
  if (request.getSession().getAttribute("user")!=null){
   log.info("用户已登录，id为..."+request.getSession().getAttribute("user"));
   Long userId=(Long)request.getSession().getAttribute("user");
   BaseContext.setCurrentId(userId);
   filterChain.doFilter(request,response);
   return;
  }
  log.info("用户未登陆");
  //5.如果未登陆则返回未登陆结果，通过输出流方式向客户端响应数据
  response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
  return;
 }

 public boolean check(String[] urls, String requestURI) {
  for (String url : urls) {
   boolean match = PATH_MATCHER.match(url, requestURI);
   if (match) {
    return true;
   }
  }
    return false;
 }
}
